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Biology exam questions




Question;1. Choose the following that best;characterize the formation of uncontrolled division of cells or cancer.;a. mutations in DNA for the protein which;activates repair enzymes;b. mutation in genes for inhibiting the;cell cycle;c. mutations in proto-onceogenes/tumor;suppressor genes;d. active telomerase;e. All of the choices are correct;2. When cancer cells metastasize;a. tumors release growth factors;b. tumors spread throughout the body;c. tumors have nondifferentiated cells;d. tumors get larger and larger;3. Genetic testing for melanoma involves;the search for;a. RET gene;b. BRCA 1;c. p16 gene;d. ras oncogene;e. MRI;4. Choose the following letter designation;for attached/unattached earlobes that represents homozygous receive genotype;a. EE;b. Ee;c. ee;d. None of the choices are correct.;5. In crossing two heterozygous parents;what are the chances that an offspring will receive a dominant allele?;a. 75%;b. 50%;c. 25%;d. less than 10%;e. None of the choices are correct;6. Some inherited traits are also;influenced by the environment. An example is;a. ABO blood types;b. coat color of Himalayan rabbit;c. human behavioral traits;d. both coat color of Himalayan and human;behavioral traits;7. The process of making a copy of DNA is;called;a. duplication;b. replication;c. isomerization;d. transcription;e. translation;8. Mutations can be caused by;a. errors in the replication process;b. exposure to environmental substances;c. base substitutions;d. All of the choices are correct;9. Which of the following are paired bases;in DNA?;a. adenine--guanine, thymine--cytosine;b. adenine--uracil, guanine--cytosine;c. adenine--thymine, guanine--cytosine;d. adenine--adenine, guanine--guanine;e. adenine--cytosine, guanine--thymine;10. The earth's primitive atmosphere formed;by volcanic gases had little;a. water vapor;b. carbon dioxide;c. oxygen;d. nitrogen gas;e. hydrogen;11. An organism that takes in preformed;food, and cannot manufacture its own food is called a;a. heterotroph;b. autotroph;c. homotroph;d. prototroph;e. oligotroph;12. Primates;a. are a taxonomic classification category;b. include only monkeys and apes;c. preceded the evolution of most organisms;d. are currently threatened with extinction;13. Energy is passed to detritus feeders;through;a. excretion;b. death;c. defecation;d. All of the choices are correct;14. Bacteria and fungi are decomposers;because they;a. live on the elements directly;b. are parasites;c. live on dead organic material;d. eat living plant material;15. Aquatic plants and algae are eaten by;small fish called shiners. The shiners are eaten by turtles and bluegill fish.;The large fish called a pike will eat the bluegill. Which organism is probably;present in the fewest number in this aquatic ecological pyramid?;a. aquatic plants and algae;b. shiners;c. bluegill;d. turtles;e. pike;16. Taxol is;a. chemotherapy;b. radiation;17. Which of these tumor antigens tests for;liver tumors?;a. PSA;b. AFP;c. CEA;d. CA-125;18. List 5 dietary guidelines that greatly;reduce your risk of developing cancer;19. Unsaturated fatty acids have a tendency;to form free radicals (highly reactive organic ions that have a non paired;electron), which may damage DNA. With this knowledge in mind, hypothesize why a;low-fat diet reduces the risk of breast, colon and prostate cancers.;20. In a paternity suit the alleged father;has blood type AB, the mother blood type O and the baby has blood type O.;Choose the most accurate statement below.;a. The alleged father must be the biological;father;b. The alleged father could be the;biological father;c. The alleged father could not be the;biological father;d. None of the parental blood types match;the baby;21. Amniocentesis reveals that an embryo;has Tay-Sachs disease. The parents appear normal. What are the chances that a;later child of these parents will have Tay-Sachs?;a. 0%;b. 25%;c. 50%;d. 100%;22. Why are X-linked phenotypes more common;in males?;23. Give examples of traits with the;following patterns of inheritance: incomplete dominance, multiple alleles and;polygenic inheritance.;24. The bases of DNA form what we can think;of as "code words" representing the different amino acids. Each;code word" is composed of;a. a triplet of nitrogen bases;b. a triplet of amino acids;c. 2 nitrogen bases;d. a single nitrogen base;25. Transcription takes place;a. in the nucleus;b. in the cytoplasm;c. on free ribosomes;d. in the rough endoplasmic retuiculum;26. Explain the meaning of the word Proteomics;27. Define "Ex Vivo Gene Therapy;28. Which evidence for evolution uses;remain of previous plants and animals?;a. the fossil record;b. biogeography;c. comparative anatomy;d. comparative embryology;e. comparative biochemistry;29. The theory of evolution by natural selection;was developed by;a Thomas Malthus;b. S.W. Fox;c. Stanley Miller;d. Charles Darwin;e. Niles Eldredge;30. Describe how the earliest organic;molecules formed.;31. Describe the protein-first hypothesis;and how it explains the origin of life.;32. The bacteria that return soil nitrogen;to the air are known as;a. denitrifying;b. leguminous;c. nitrogen fixing;d. nitrifying;33. Pollutant-containing smog can be;trapped next to the surface of the earth by;a. assimilation;b. acid deposition;c. thermal inversion;d. denitrification;34. Explain how water, which should be a;renewable resource, may become unavailable.;35.Sometimes, we are under the impression;that all bacteria are harmful. What evidence you can give from this chapter to;counter this belief?


Paper#62659 | Written in 18-Jul-2015

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